My only complaint is that certain things aren't always visible through the world portals, such as the redirection cube in the room next to you. Also, the game stops rendering what's through a world portal after about the second or third one, giving you an incorrect impression of the space. I understand that this is probably an engine limitation, but I'd recommend avoiding long hallways of worldportals in order to prevent that misleading visual element.

This was crazy awesome! (I wish that there was a way to for me to make the linkedportaldoors render the mirror effect for longer distances though... it would really help the aesthetics in maps like these) Oh and I messed up my first time but on the second run I figured it out by starting with placing 2 cubes in line of the recepticles. However I had to flip a cube upwards to get my solution :3